[BUG] Fix WebKit crash with Tracing tests

[mxschmitt]

Reproduces consistently on our secondary tests. Looks like it started happening when we switched to Ubuntu 22 for the tracing tests which means before we were running a frozen WebKit version for the tracing tests.

Repro: PWTEST_TRACE=1 npm run wtest library/page-event-crash.spec.ts:39?

frame #5: 0x0000754959a09d6a libWPEWebKit-2.0.so.2`WTFCrashWithInfo(int, char const*, char const*, int) + 26
    frame #6: 0x000075495a121dda libWPEWebKit-2.0.so.2`WKWPE::ViewLegacy::callAfterNextPresentationUpdate(WTF::CompletionHandler<void ()>&&) + 58
    frame #7: 0x000075495a1b1d07 libWPEWebKit-2.0.so.2`WTF::Detail::CallableWrapper<WebKit::WebPageProxy::callAfterNextPresentationUpdate(WTF::CompletionHandler<void ()>&&)::$_0, void>::call() + 87
    frame #8: 0x000075495a1b1f43 libWPEWebKit-2.0.so.2`_ZN3WTF6Detail15CallableWrapperIZN3IPC10Connection31makeAsyncReplyCompletionHandlerIN8Messages11DrawingArea28DispatchAfterEnsuringDrawingEZZN6WebKit12WebPageProxy31callAfterNextPresentationUpdateEONS_17CompletionHandlerIFvvEEEENK3$_1clINS8_15WebProcessProxyENS_23ObjectIdentifierGenericIN7WebCore18PageIdentifierTypeENS_38ObjectIdentifierMainThreadAccessTraitsImEEmEEEEDaRT_T0_EUlvE_EENSA_IFvPNS2_7DecoderEEEEOSP_NS_19ThreadLikeAssertionEEUlSS_E_vJSS_EED0Ev + 83
    frame #9: 0x0000754959f76308 libWPEWebKit-2.0.so.2`WTF::Detail::CallableWrapper<IPC::Connection::sendMessageWithAsyncReply(WTF::UniqueRef<IPC::Encoder>&&, IPC::ConnectionAsyncReplyHandler, WTF::OptionSet<IPC::SendOption>, std::optional<WTF::Thread::QOS>)::$_0, void>::call() + 24
    frame #10: 0x000075495ba4a5f5 libWPEWebKit-2.0.so.2`WTF::RunLoop::performWork() + 549
    frame #11: 0x000075495baea9c6 libWPEWebKit-2.0.so.2`WTF::RunLoop::RunLoop()::$_0::__invoke(void*) + 6
    frame #12: 0x000075495bae9dca libWPEWebKit-2.0.so.2`WTF::RunLoop::$_0::__invoke(_GSource*, int (*)(void*), void*) + 74
    frame #13: 0x000075495311bc44 libglib-2.0.so.0`g_main_context_dispatch + 372
    frame #14: 0x00007549531712b8 libglib-2.0.so.0`___lldb_unnamed_symbol2709 + 488
    frame #15: 0x00007549531193e3 libglib-2.0.so.0`g_main_context_iteration + 51
    frame #16: 0x0000754955106fb5 libgio-2.0.so.0`g_application_run + 421
    frame #17: 0x00005f6695b3087c MiniBrowser`main + 876
    frame #18: 0x0000754952a29d90 libc.so.6`__libc_start_call_main(main=(MiniBrowser`main), argc=4, argv=0x00007ffec2efae88) at libc_start_call_main.h:58:16
    frame #19: 0x0000754952a29e40 libc.so.6`__libc_start_main_impl(main=(MiniBrowser`main), argc=4, argv=0x00007ffec2efae88, init=<unavailable>, fini=<unavailable>, rtld_fini=<unavailable>, stack_end=0x00007ffec2efae78) at libc-start.c:392:3